update debian files (remove obsolete install script)

debian/srslte.install

-#!/usr/bin/dh-exec
-srsue/ue.conf.example => usr/share/srslte/config/ue.conf
-srsenb/enb.conf.example => usr/share/srslte/config/enb.conf
-srsenb/rr.conf.example => usr/share/srslte/config/rr.conf
-srsenb/drb.conf.example => usr/share/srslte/config/drb.conf
-srsenb/sib.conf.example => usr/share/srslte/config/sib.conf
-srsepc/epc.conf.example => usr/share/srslte/config/epc.conf
-srsepc/mbms.conf.example => usr/share/srslte/config/mbms.conf
-srsepc/user_db.csv.example => usr/share/srslte/config/user_db.csv